Dennis was born on March 8, 1947, to Dale Flanagan and Helen Miles in Hot Springs, South Dakota.
He is survived by his wife: Florida Flanagan, 2 children, 1 brother, 1 niece, 1 nephew and a host of aunts, uncles, cousins ​​and extended family.

United States Veteran Flanagan of Lakeland transitioned Wednesday, February 7, 2024. A visitation will be held Thursday, February 15, 2024 from 11:00 a.m. - 1:00 p.m. with the Celebration of Life to follow. Interment will follow the Celebration of Life at Oak Hill Burial Park - 4620 US Highway 98 South, Lakeland, Florida 33810.

Interment: Oak Hill Burial Park